Have used the Nissan Ester since June 2009 when I purchased, but its rather pricey so probably not what you are looking for.

Redline 5W-30. $10 per qt. delivered to your door when ordered by the case from Amazon.com. A Mobil 1 110 filter or a Purolator Pure One. Change the oil yourself. You'll know it was done right. The VQ37 is a high strung, hot running sports car engine. Spend a few extra bucks and use the best.
The Pennzoil Platinum and Pennoil Ultra is also getting good reports with the VQ35 and VQ37 engines and it's a bit less expensive.

redline 5w-30 and K&N filter here.

For those using Redline, have you experienced any decrease in oil temps?

Shell Rotella 5W-40 here. German Castrol for the STI. RP

Not me. Still running as hot as ever. Oil cooler in the spring.

My Z is just shy of 10K miles on the odometer. I have been running the Redline 5W-30 oil since the 5K mark. I have not seen a noticeable difference in the oil temps but it never exceeded about 235-240 in spirited driving even with less than 5K on the engine. I don't think a valid opinion could be drawn regarding the oil and temps until car had a lot more than 10K miles on it. Many report that as the engines break in, temps drop a little.

thx guys....

Castrol Syntec 0w-30 "German Castrol" seems to run really well in my Z. I'm on my 3rd fill of it, the first two looked great in the UOA results.

x2 on the German Castrol. Really good stuff. I also highly recommend the NAPA Gold or Purolater Pure One filter. I go with the NAPA generally since my local store has filters 50% on every Friday.

I have used Amsoil with Mobil 1 Oil filters and AmsOil filters in my previous cars...will do the same with the 370z

I have had Ester and Royal Purple in mine..

I noticed no improvements in anything with RP so I went back to Ester.. with Puralotor Pro 1 filter..

yup I tried Ultra also and didnt notice anything, went back to Platinum :tup:

RP is an ester based oil.

My dealer tells me that all 2010 370's come with the Ester oil and that dealers are instructed to strongly suggest synthetic only. I bought the 6 oil change maint plan (it saves me about $30 in 3 years). The plan docs say that it covers only the normal petroleum-based oil. I called the dealer and got the general manager. Even though the plan says it won't pay for the Ester oil except for the GT-R and the Altima Hybrid, the GM said that the plan also includes Ester oil for the Z. The dealer won't do an oil change with anything other than ester or another synthetic you bring in yourself on a 370.

I have been using Mobil 1 since it came out. I swear by it. There was an article somewhere that said Mobil looked at Ester oil and determined it was a high quality synthetic not unlike theirs.